I have a standard Wahoo outfront mount on extension positions my elemnt centrally between the bars. Far enough forward that I can see it. Definitely not in way of my arms or elbows.
Are you using a particularly upward set of TT bars? I did need to add some rubber inside the clamp to make the fitting tight enough as I think it is designed for 25 or 38mm bars rather than 22mm extensions.
(and yes I did put tape around it to try and make it more aero… )