Photo and Sales Site Evidence is supplied for a Tandem Rack, the OP has a alternative to consider.
My Take is that the best materials can be bought into at not too much monies when compared to some Brands products. The method will enable the creation of a Support, that most, if any, at any cost on offer will be able to surpass.
Is it not up to the OP to decide which is the most attractive option for themselves.
For the future, another forum member/visitor has access to the info from the suggestions offered to be considered, it is all a valuable info in relation to the OP's request.