Heavy machining floorplate/surface plate installers

We are looking to expand our manufacturing capability for one of our horizontal boring machines. From my searches it seems like any factory new T-slot floor plates are sourced out of country(I’m in the USA). We could buy used as well.

Anyone have any info on installers for these plates or where to source new ones domestically?

For reference I am looking at an 8’ x 26’ area, and concrete work will need to be done to set them in the floor.