Speaking event in a large space

[J_Dunavin]

This is a 120' x 75' space in a hangar that we are setting up for a speaking event.
We have set up for this in the past with these speakers: https://www.adorama.com/dbtarena12.html arranged around the seating area.
I'd like to think we can do better, but there is a concern with reflection off the hangar doors in the back.
I thought about stacking the speakers on either side of the stage, but I don't have a great wat to secure them, and they are a little too narrow to stack nice like DRs or Otops

Any ideas on how we could arrange things differently, or is this acceptable?

[Bill Fitzmaurice]

Point sources never work well in reverberant spaces as they have very little vertical pattern control. It's a tailor made application for line sources.

[J_Dunavin]

what about reflections from the back wall and causing feedback issues? Or are we talking about two separate issues?

[Bill Fitzmaurice]

Feedback only happens when the mic is close to the source. What you will get is reverberation that's why a gym sounds like a gym.