Any detector will work
And yes the lce module or honeywell Ethernet card will work well with the selfmon remote keypad (you don't have to sign up for selfmon ,app keypad still works well)
I think the honeywell app is only for the flex and dimension , and it isn't stable and harder to set up in my view
Rss is the remote servicing suite , I wouldn't bother with that
Remote viewing I assume you meant remote keypad control