Subframe connectors for a driver/cruiser, necessary to weld to floor?

I have the Hotchkis connectors, they can be welded in without pulling the interior, I did it that way. They have some angles cut in them so there is no offset from the front subframe to where the front point is welded in and they have brackets to spread out the load, a good design practice.

The car will rattle less with connectors. My opinion its one of the must haves for these cars. The USCT ones I wouldn't spend the time on at all. It's even more wild when you see how much people care about this vs that on that and will absolutely whack the torsion bar crossmember out for a transmission and put a piece of bar stock in there. I like beefy stuff, the Hotchkis are good for their purpose, very light also, but you won't be able to jack the car up in the middle of them due to the wall thickness.

The bolt connectors would be quite bad without spacers to hold the frame rail from crushing.