The title company (or escrow or however settlements are handled in TX) should protect you.

I've been to multiple homicides where the bad guy was stopped because someone had a weapon and wasn't afraid to use it to protect themselves or someone else.  

I have learned a lot about how to handle it if it does happen again, and also about how to structure future leases to be better protected in the future.

If these folks have lived there for a while maybe they are just a little control freakish about protecting their complex - especially if the last person was deviant and there are a bunch of renters - they probably have been through a lot and have to stay on top of things.  

I write the liability portion two ways an OCP (owners and contractors protective) which covers claims relating to construction.

I am wanting to make sure I provide myself enough protection.

Is the idea to have the alarm to protect your property since it's vacant or to make it market better when you try to sell it?

Because of using your real name and other info. to form an LLC and it being recorded in the system so the government will know you're doing some type of business and tax you accordingly, I feel that having a land trus...

Our intent is to protect our nearby property by controlling what goes up on that property - and would be happy to sell our share to them or let them work off their payments via the rentals over time. 

Lots of info you could have read to guide you and protect you in advance.