Transmitter trays ... love 'em. Been using them for years.

This is my current one, made from a bit of spare ply and some oddments. You can't see from the photo, but at the rear, there is a small drawer which houses a couple of sandwiches and a small flask of coffee.

Single hang-point, fabricated from a large bolt.

There are several ali brackets which tuck into my belt and keep the tray close to my body. I can still fly a naked transmitter, if I need to.

The problem with the sun has already been mentioned... easy fix; don't fly through the sun.

Like most of the questions posed on this site, there is no definitive answer, since we are really talking about "preferences".