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Variable speed is a must, as you'll want to use a bit similar to an Amana RC-2555.
www.amanatool.com
You only want to spin it at 12,000-14,000 rpm.
You don't need micro adjustment imo, as you'll be removing a fair amount of material with each pass.
You'll need a pretty substantial fixture to span 6 ft without sagging a lot, if you want truly "flat" slabs.

RC-2255 CNC Insert Carbide 3 Wing/Flute Heavy Duty Spoilboard Plunging, Surfacing, Planing, Flycutter & Slab Leveler 2-1/2 Dia x 53/64 x 1/2 Shank Router Bit
Insert Spoilboard Plunging, Surfacing, Planing, Flycutter & Slab Leveler Router Bit
You only want to spin it at 12,000-14,000 rpm.
You don't need micro adjustment imo, as you'll be removing a fair amount of material with each pass.
You'll need a pretty substantial fixture to span 6 ft without sagging a lot, if you want truly "flat" slabs.