Best install if the counters are standard hight from the top new floor and not the slab.
Use thinset and wonderboard not plywood to level the floor if you go that way. Diamond blade on a 4" grinder scores it nice so you can break it off to fit. Thinset Needs 24 hours to dry before full streangth though. You would need two 1/2 " pieces but you could cut them out of one 4 X 8 if the dimensions work out. Just keep the two layers of mud to 1/2" and your all set.
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