Foot for Maxx Bathtub

Re-doing the master bathroom. The free standing bathtub from Maxx out of Canada uses 4 9/16" bolt heads as feet. I am planning to place the tub on a ceramic floor. This is a lot of weight for such a small pressure point as a bolt head. I designed a foot that is 1.75" on the tile side and the bolt head fits on the top side. Additionally I made a .0625" inset on the tile side so a 1.5" stick-on felt pad will be in-contact with the tile and held in place when sliding it in place. I hope this will s