I, too, use quite a number of cattle panels w/ t-posts purchased from TSC. On pasture fences, on corners (formerly Hi-tensile wire, so 8" posts set in cement), most panels are stapled to the posts. On the line, they are tied to the fence posts every 8' - not overlapped - using hay string (not as pretty as zipties, but FREE and have LOTS).
I don't have tiny minis. I have larger double registered mini/shetlands, larger shetlands, shetland horse x's & full size horses. I choose one pasture that will hold the more dominant ponies, and put all the posts with the flat edge towards that pasture. Then the panels get attached on the INSIDE of that fence line - stronger that way. I have not had any problems with mine getting injured on the edges BUT have had dominant mares fight "over" or thru a fence line - permanently bending the panels, ripping them off the posts and loosening the fence posts that were 3' deep in the ground (don't cement any t-posts).
Large horse (15.3 hh) checking out two Shetland fillies. Panel is upside down and was later fixed. The round pen on the inside of the pasture. The pasture fence here is still hi-tensile wire.
Metal t-posts are no longer made in 8' lengths
I was getting them in 8' lengths and sinking them approximately 3 ft deep (very sandy soils). That made the tops 5' above ground. Now they are 7' long, so I am sinking them 2' deep to have them roughly the same heights. I have attached the toppers of different types but have had too many shetlands and shetland crosses that like to remove them - finally gave up... Right now, most fence lines do not have them on them. If I ever completely get my "act" together, I'd like to put up a hot line (tape) from Horse Guard on the tops of the posts - nice to look at and will keep the larger ponies/horses "off of" the fence line. They do rub on the fences - bending the panels sometimes. Nice thing - if they aren't overlapped - it's EASY to replace a panel!!
I also have my 50' round pen made of panels and I now use panels for cheap and easy hay feeders for our round bales that REALLY save on hay waste. Will save more when I get or build pallets that keep the hay off of the ground. For temporary pens/stalls, I do use double ended snaps and no posts. Can then move the square 16 x 16 foot pen around on grass to house my stallion away from the mares as I didn't breed any mares this year.
You can see the fenceline in front of the barn here. Took years to put that gate in - don't know how I lived w/o it, LOL! You can see that it would probably be "prettier" with zip ties or even metal to tie the panels to the posts but again, the hay string works for me... The hay feeder is also "tied" with braided haystring (single strands don't last thru multiple times of tying and untying). It becomes somewhat "tear drop" shaped. You can put a tarp over it to protect the hay OR you can put the whole thing under a shelter or whatever...
The fence line between the boys and the girls. I have the most size differences in the boys - and currently have 2 - 2 yr old stallions running with geldings. The pony in the center is a larger shetland x that will mature around 12.2 hh (50" tall) and the butt on the far right is part of a 1/2 shetland that is now 13.1 hh. Later this winter (13/14), will be putting the 3 newly weaned boys in with the "big" boys! There is a smaller pen inside the pasture, along the back yard of our house. It was started as a stud pen and has been used as a pen for a mare that was sick (delivered a dead foal after starting on antibiotics in Feb 2013).