They are not required and for all practical purposes, you should stay away from them except for decorative (read: Faux cooler) purposes only. They can put added strain on your oil pump. If I had known prior to drilling holes in X-frame that I did not need an oil filter relocator with 4 into 4 headers, I would of scratched the relocator as well. Extra plumbing that is not needed in my opinion.
I will eventually install a faux cooler because it looks very cool. But it will never be connected to motor.