For what it's worth, I did Google search and search the site for this question, but only got irrelevant results.

I also see a lot of hotels posted for sale on commercial real estate listing sites. 

I say you don't need to consider security cameras (or even trail cameras)- but you could put fake ones out or if you had wifi on site o(r wanted to go the sim card/monthly route), that's not an expensive option either.

There's no need to go looking for something complicated. 

The wifi is what will allow you to access the door remotely.If you don't want wifi on it, Then you can still get a smart lock you'll just need to pre-program several different codes into it, and then give out those codes appropriately but you'd need to be on site at the door itself to program initially or update it.From personal experience I find the touch screen or wifi locks to be complete POS's that are not reliable and the battery does not last long.  

Hello, I am new to this forum and site.

In a contract for deed, often done with seller finance deals, the answer is a little complicated.

make sure to look at other development analysis don't just buy a site 

So, I am not sure how I would pursue damages and unpaid (2 months rent) if I wanted to.In hind site I should have kicked them out, but I didn't - lesson learnt.  

You don't need a site or to pay anyone.