If you use a piece of plywood for a base your new tray should be fine just resting on the rim of your reservoir if you don’t want to go through the hassle of making a stand for it.
When I was growing flood&drain in my 32x32” tents I was so limited on height I didn’t have enough head room for a stand. I did what you’re doing and had the trays sitting directly on the reservoir.
Here’s my ebb&flow set up in my 27x27” tent with the tray on top of the reservoir. I drillied out a couple openings on the top rim for a pump out hose that I can slide in and out and electrical cords. To maintain the reservoir I just slide the tray back a few inches and dip my PH and PPM pens in there and top off with fresh nutes.
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I'm hoping the taller tent will let me set a stand up m8.. seems much easier for a rookie flood and drainer! If I took the rest of this white cheese out I'd have the other half of the tent to get the table balanced.. that's the easy option lol May just do that although I did want to give it a blast for a week on the table while I'm experimenting. I'll think it over today while in work trying to do anything but work
I also can't make my mind up for next grow between pots of croutons on drip rings, pots of croutons in f and d, or blocks on blocks in f and d. I've changed so many times in my own head typical stoner.. I was all for croutons in pots on the drip.. but these blocks are really impressing me now they're in flower and flood and drain is a fair bit easier than drip rings in all honesty.. decisions decisions.. the life of a wannabe rockwool grower.