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Brett,
To get the pier bedded on the footing -
Without having to get the slab perfectly level - which can be very hard if you have set the mounting bolts into the slab at the time you pour.
ie the mounting bolts can be attached to a simple metal frame that gets set into the concrete at the time of pouring.
The other way is to drill holes and use chemset or similar to glue in threaded rod, or use standard masonry anchors.
Just make up a small amount of slurry level and spread that flat and evenly over the footing the moment before you tighten up the bolts/nuts.
Get the pier level, tighten nuts firmly but not to full tension, allow the slurry to cure and and then tighten the bolts to full tension.
Or you can get expanding concrete used for this specific purpose - set the pier onto the bolts/threaded rod protruding form the pier footing, using jacking nuts under the pier mounting plate and adjust them until the plat eis level, tighten the hold down nuts on top and then ram and pack the expanding concrete under the pier.
It can be done without expansing concrete too !
For a pier it will be fine.
The slurry is in compression so you dont really need that much to be effective, just shove it in until no more can be pushed in without some coming out the side and smooth off the sides at 45 degrees.
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