Just as an alternative idea here’s what I did. I concrete tap in anchor with a custom all thread bolt. The anchor is installed normally. The all thread rod is cut to length with flats cut into the top in order to tighten the rod if needed. A washer and nut is run down the all thread and tightened to clamp onto the floor. This eliminates any slop or moment of the rod. Another washer is added for a smooth landing for Maslow. Finally another washer and a loose nut is added on top of the Maslow anchor point.
Anchor snugged up to the ground (Ignore the blue tape - Parking guide line for the car)
Picture illustrating the whole assembly.
Has been robust, cheap and effective. Was worried about the brass with the pool anchor though like the flush mounting. To make these flush I remove the all thread add just a small bolt / plastic plug to cap the hole.