Great question and I broadly agree with the other posts...a few things i would add...
First, getting the front lifted up, you can go with a variety of options but in any case I would suggest a ‘bulge’ bikini/brief/thong/BB. For this i like Joe Snyder, Manstore, Olaf Benz, Muscleskins (poser) and the like. They all have very fitted pouches and look as great as they feel.
Second, for the back...sadly this is a tough thing to do if you don’t have much of a tush. Most underwear won’t lift anything at all unless it has pads (yuck). Though i’m A skimpy underwear lover, you might want to try some boxer briefs that have high spandex content. Jocks really don’t do any lifting as the straps would have to be so tight they’d be uncomfortable to wear.
Let me know what you find out there