you definitely wont have enough room to double stack the pipes one behind the other like that. unless you use ridiculously skinny piping.
stacking them on top of each other might be a better idea. use the right PE outlet to go to the left bumper cutout, and route the left PE outlet over the other pipe to go to the right bumper cutout. see my drawing at the bottom.
either way it's going to be super restrictive and will likely dampen noise due to the bends and longer piping. on my dual exhaust there's definitely less flow and less sound coming out of the right side.
performance might take a hit due to the increase in restriction of flow, but might not be noticeable unless you dyno it.
safety shouldnt be affected. it's just an exhaust, not a safety structure. in an accident it will just get crushed or bent.