You can glue down solid 3/4" wood or anything else to concrete. A calcium chloride test or rapid RH test needs to be performed prior to installation to determine how much ground moisture your slab emits. If it emits too much, a moisture barrier must be applied on the concrete prior to glue down install. Those products are a whole other topic I won't bore you with. Some are epoxy primers some are troweled, self leveling membranes. Your adhesive FYI does block moisture up to a limited percentage. Remember, you cannot glue down solid wood below grade, only engineered.
Second thing to keep in mind about adhesives for wood floors is they need to be elastomeric. This adhesive "stretches" while maintaining its hold on the wood. It allows the wood to move (expand/contract) throughout the year. Mapei, Bostik, Sikka, Dri-Tac, Stauf, and Bona all make good adhesives that will work. They are not cheap though. Most of them will be urethane adhesives, the Bona R851 is a silane based product. The big advantage to glue downs is finished height. You can often flush where you hit tile or carpet while solid nail downs require a 3/4" minimum subfloor. By the time a solid is installed with subfloor you are sitting at 1 1/2" above the concrete and transitions are needed unless your builder recessed the slab in advance.
Here's something else to remember: when gluing down direct to the concrete, the slab must be pretty level. Most slabs in my experience need at least a bit of grinding, and or primer and leveling compound poured. These are costs that will make you wish you had just "floated" a subfloor over it and done the nail down. Glue down installs are also more tricky. Making sure the wood is strapped or taped together while glue sets up is your first challenge. Then you have to make sure the floor is weighted down to ensure good contact between concrete, adhesive, and wood.
7$ a foot installed doesn't sound bad. Just don't buy a product that can't be sanded/refinished down the road or is on closeout or being discontinued. Great price but if something happens to the floor you will not be able to repair it (unless you bought extra wood) and your house will be torn up all over again. Talk about dust..... Took a road construction type compressor an demo hammer to tear out the last glue down another company botched. What a mess.
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I really need to get them re-done but either need something (Near) indestructable for a top coat or wait for the dogs to pass away...
