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You have a boiler in the garage? Assume hydronic? or not
Why not space heaters? Lot less expensive. What's the goal here, keep it above freezing in the garage all winter or just warm it up when you work in the garage? For the latter, space heaters as it will take hours and $$$ for the slab to heat and warm the garage.
Why 6" slab? Heavy trucks in garage? Maybe you feel that you need the mass to keep it warm?
Mesh should be in the lower 1/3 of the slab, not in the middle or upper, regardless of where the tubes are. The mesh is to help with tensile stresses, which are the bottom half of the slab.
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