We tried one of these setups last year. What a disaster! The deer would NOT hold still long enough to get the targets stapled on to them, and if you did manage to get one staple in, the local bunnyhuggers were out in force screaming "Cruelty!"
We finally threw up our arms in disgust.
It was far easier to just shoot at targets set up on a little wagon, or take a tire and put targets in the center of it on plywood, then roll it. Great fun.