Why?
I went through a phaze of using CCTubes in my PCs for a while and they often had dual tubes on one inverter!
Especially the 4" ones... They all came in dual.
Even so, even when I setup my CCM with UV junk, I had 6 inverters driving 10 tubes ( 4" and 12" and you could not see the tubesa or inverters so I must have been doing somethign right and it lit up the UV bits a treat.
Of course I have grown up now and I no longer do anything as childish as that anymore, so ner ner nerner ner.