Personally I think you should just go ahead and make a rackThey are lovely once you have them. So easy!
You can actually make them pretty cheaply too. I spent around $300 on mine, mostly because I used some fancier wood and hardware on mine.
I think you could easily complete the whole thing for under $200.
I just slide my tubs in right over the flexwatt, there is a tiny gap because of the feet of the tub, but that is it.