I think ole Rdfx's first resppone was the best advice a fellow could get. Coyotes are coyotes and every bit of force and tear up they give on a trap they give to a snare! The height and loop size are only the tip of the issue...cable size, refusals vs chew outs; snare length; relaxing vs none relaxing locks; swivels or not; releases and breakaways, entanglement and more.
For example, I snare where there are no pets, deer and elk yes, pets no. I have no real interest in killing our Grey fox and she cats. Therefore, I use non-relaxing snares (mostly Ambergs and some camlocks with Hal Sullivans S hooks for releases) on long cables often 12 inches off the ground and 12 to 15 inch loops. I miss most fox this way, can use 5/64 cable, avoid water heads and often have no set tear up, cause they'er dead fast. Do this in an area where you have pets and you will have problems. This is just a bit of the issue! Read study and consult Please!