Haven't used those. The POLY mounts are good if you can find them, (and are expensive.)

I sort of make my own Mighty Mount, but use a single 3/8" grade 8 countersunk screw with the countersink/head on the frame side, and then drilled all the way through the engine mount bracket, with a locknut on that end.
The motor mount end plates are just too thin to work as a nut.