I keep a good amount of small osage blocks around that I split/cut out from my scraps and unusable staves splits, or ends I cut off on staves, exc exc, as blanks for tip overlays and arrow rests. I like to use a wrap handle and some light glue to hold the arrow rest in place, or sometimes just a nug wrap handle only. I am a left handed archer (even though I'm a right handed everything else
) so that way, if I wanna trade a bow or something I can just take the arrow rest off the right side and put it on the left side. Generally though, I just like the look of a "tricked out" arrow rest under a leather grip.
I personally prefer to shoot off my hand, and that's the only way I can hit anything 20 feet away or more. Probably just because I haven't practiced with a shelf. I will say shooting off your hand will make your fletching and fletching whipping a thousand times more careful.