Toilet flange in basement bathroom

[PinehillJoe]

We are finishing a bathroom in our new house. The builder did a rough in for wastelines, and we hired his plumber to install the shower pan, and install a toilet flange. I should have asked the plumber not to glue the flange and glued it myself when the floor was ready. The top of the flange is just above the concrete floor. We picked out the tile and I plan to add Oatey spacer to bring the top of the flange to about 1/4 inch above the finished floor.

I plan to Glue the Oatey spacer to the flange, the flange is clean so no reason not to glue.
Back fill around the flange with mortar or Drylock
Add 3 or 4 - 3.25" Tapcons to hold the flange in place, I thinking of putting the tapcons in while the mortar is wet and let the mortar set around the tapcons.

Does that seem reasonable?

45 is the flange and spacers, 68 is the rough in, 311 is the shower fyi

 

[Breplum]

tapcons in the fill mortar are worthless. Only cured concrete will hold them, so the longer the better... Silicone between spacer and flange is all that is needed

 

[Sponsor]

 

[PinehillJoe]

tapcons in the fill mortar are worthless. Only cured concrete will hold them, so the longer the better... Silicone between spacer and flange is all that is needed

Since I need to pour mortar or gravel mix, could I use 3/16 J bolts instead of TapCons?