I regularly use the high-strength velcro (the all-plastic type, not the fuzzy one) to mount ESCs and receivers in my vehicles. I only had one problem in my TC4 where the Novak Super Sport Brushless ESC popped off during a carpet race when I hit the wall. I also broke an outdrive, so the I had to stop anyway.
The velcro I like the best is one I bought at Radio Shack.
http://www.radioshack.com/product/in...entPage=family
This is the type that is currently holding my Mamba ESC and my Hitec receiver in my Mini-T. I also used it to hold the new-style MGM 8012 in my Jato, as well as several other applications in previous vehicles.