I have both the EcuTek BT Connect and a stand-alone AEM gauge.
I have placed my gague on top of my cluster “it was temporary location” at first but i loved how its stright on my line of sight without obstructing ny view on the road so i kept it there.
Even though i have a proclip mount for my phone i still find it hard to look at the screen while on WOT.. just two days ago i was having fun with the car and doing a WOT I glanced at the AFR and saw it reading 15! so i let of immediately .. so having the gauge at a quick glace could save ur engine. My 2c