I have ankle carried a BUG for over 25+ years. Most of that time as a LEO, but I continue the practice when working in a LGS/Range since I have retired. IMO, ankle carry has it's uses as primary carry when attire makes belt or pocket carry problematic. Likewise when driving.

I'm very picky on my holster choice. My Desantis model 044 has stayed put while running, climbing fences and getting hands on. Others not so much.

Training with the draw is critical. A lot of training. Muscle memory lets me to know where to grab the pants leg allowing a smooth draw without looking. A short step back with the off leg and there it is. There are drawbacks. You need both hands (for speed) and it is still slower than belt carry. BTW, I also carry my defensive knife clipped to my off hand pocket for more options.

If you feel the need for a second gun, ankle carry is a valid choice. YMMV.