I can't see any need for an UCA mount until you have significantly increased power and / or run racing tires.
I also have a couple Spohn del sphere parts. I actually plan on posting a long thread about my troubles. Their customer service is complete garbage.
Basically, they ship out their del sphere joints adjusted so that they feel tight by hand, but will quickly develop play on the car and clunk. They also do not have a torque spec for its adjustment. "As tight as you can get it with a ratchet" is what they'll tell you. Yeah, that takes the guess work out.
My UCA was shipped at about 0.6" longer than stock, so if you didn't check yours, you should. I also love how they didn't put a tiny metal tab on the mounting flange to capture the factory bolt head, which means you have to use a second wrench when torquing it. Thanks guys!