If you must-buy the Dubro Iso Mount. I've used them on several planes, they do work well. Moves the engine a bit forward and some engine movement happens but all in all-good product.
My latest use of one is in a Corsair 60 size with a YS110S (serious shaker) softens it quite a bit.
My 4*60 with a 91 OS has one and it is smooth as can be. 100's of flights on it.