I think that the slope is small enough that if I recess the stand into the half inch foam, then if need be I can place foam under the track bed to raise it the small amount that I need. As in years pass, and what my pictures does not show is that the layout sits on 8 inch oak legs. I did this 3 years ago so I could place transformer's, wiring etc. under it all so it can't be seen. Then I go some cute Christmas patter cloth and Annie made a skirt that I staple around it all to hid it. Oh. I also will curve cut the outside corners like I did in the last one. I think it makes it look better.
I used that approach with a smaller tree base. The tree was around 3 1/2' tall, LED light. I didn't like the large base with the light supply for the fiber optics. I bored a whole in the table and put the base under the table. I attached it with pipe hanger strapping. Then, only the trunk of the tree protruded through the table.
Perhaps you could make a riser for the tree stand under the table and just drop the trunk through a hole in the table into the base the same way. Depends on how much clearance will result to the first set of branches.
I definitely like the trains off of the floor.