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URY installed the sleepers over an existing hardwood which is fine if it's glued tight and you don't hear ANY hollow noises when knocking with your knuckles. But if I'm going directly over a slab (or existing floor covering) I float low spots with self leveling concrete. I always use pressure treated 2x sleeper material 16" on center and blocking 4' laterally so every piece of subfloor plywood is supported all the way around. I roll DryLock on the slab in the sleeper bays to inhibit water vapor then glue and screw the plywood subfloor staggering the sheets.
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