Typicily you would only strap the rear main. I've never seen or heard of strapping all caps.
Strapping is a process designed to help the rear main gain strenght without fully machining a billet cap to fit that block. To get the registers correct you would spend twice the amount of time maching the rear as you would aligning the other four. Ever notice a rear main isn't included with a a splayed cap kit?
What happens if your making enough power to destroy the rear main cap?
You can cut the cap .500 for a drysump or .600 for a wet sump and gain roughly twice it's normal strenght. Wet sumps are drilled for a oil pump provisions.
These pictures are courtesy of CNC Blocks a their state of the art 40,000 sq ft facility.