It looks a bit like a Front Runner Slimline II and a Rhino Rack Pioneer platform had a baby...
I see the benefits of certain aspects of the design, but be aware some mounts and accessories
may need a few extra bits in order to mount to longitudinal slats.
Your call if you are drilling the front in, but I would recommend going the extra mile to do so.
Properly done, it will greatly increase the reliability of the unit. Just don't skimp on sealant!