i screwed down a piece of plastic then zip tied my esc to it. i tried the the velcro method but kept on flying off. zip tie has been flawless.
Thanks guys. I used Velcro on my speed running rustler and it worked. But I don't think it would work on a SCT off-road. I ended up using semi-permanent adhesive and I stuck it to the chassis. I don't plan on ever moving it but it will come off without damaging anything if I have to.