^^ Never seen a Bracket like above... but.. it looks OK
To Clarify.. even if Non-Stock.. hang Front pipe at Engine [easiest] hang rear pipe to tranny someplace.. Find a Way to tie the two headpipes together... the Crossover [if you have one] will thank you... Finally Unless your Mufflers are Very Light weight.. Attach one to the other at the Mufflers.
A Strap is Not good, as they Flex... the Tubular "Strap" is far more Rigid.

Something I was Taught many Moons Ago... You should be able to Lift your bike by the Exhaust System... Good way to approach these.

 

Yeah, I mounted it, and it stops the ability for both cans to resonate individually, they now resonate as a pack. So after all it makes sense, they are supporting each other now in a way.