Quick question on Motor mount for Mugen - MBX5-T

Hi, very quick pre-sales question: I am just about to buy a Mugen MBX5-T roller for conversion to BL, but before I did I wanted to check that all I would need in the first instance is the "Electric Motor mount for Mugen" from RCM? (Other than the Motor/ESC & pinion of course).

I don't quite understand the comment on the product page about mechanical braking restrictions - I just want to use motor braking, will that work fine?

I know there are also the full TeknoRC kits (out of stock), but in the first instance I just want to convert with the minimum outlay.

Any suggestions for a motor/ESC combo for less than $300 that would drop in with the minimum effort?