Advice on new gate install - LIFTMASTER LYN424

[Leeb]

Hi

New to this forum and hoping to gain advice that I am purchasing the correct openers?

I have been recommended the Liftmaster LYN 424. I am a mechanical engineer and my son is an electrician so I'm fairly confident that we should have the necessary skills to install correctly.

I have a couple of questions:

1. I think that I will need to fabricate/weld the provided motor brackets that install to the gatepost?
   
2. I'll need to run cat5 cable to the second motor which provides power and automations?
   
3. Not sure where I could put the photocells as have a 90 degree turn to make entering and exiting our property?
   
4. Do I need the photocells for this model? as it states "It also boasts stop and reverse obstacle detection which is unique to the 24v operators for added protection"
   

I have added a couple  links below of our entrance which should make it easy for comment. PS: We have decided against underground automations.

Would really appreciate your help and advice on this forum.

Thanks - Lee