RHP or UTH for retic

[holycityserpnts]

I've only dealt with burms and boas for a while and am now getting into retics. Got an subadult around 8ft coming in a few days and i just finihsed her enclosure. &ftx3ft and will add enrichment so it doesnt feel too big for her. I've read about thermal blocking recenelty and am semi worried. Would a retic do fine with strictly a Heat bulb keeping hit side around 86-88 and cool side 82-84? i could bump the temps up 2-4 degrees even higher on each side when needed, so if she took a fat meal down i can up the hot side to 90 air temp. Would that completely suffice for digestion? Just wondering if i can avoid a UTH or RHP if the snakes okay without it. If i need to get a rhp or uth w a thermostat, i absolutely will. Just seeing if anyone else out there keeps their retics with only ambient air tempd rather than Belly heat. Thanks in advance!