The detectors simply need a common wire such that one goes of, all go off. 

Add outdoor security cameras (just let guests know they’re there) and maybe some motion-sensor lights for extra safety.

Can I get them to come down in price or get them to install motion lights / fake cameras? 

Hey @Sara Valentine - huge fan of these for my rentals. https://www.amazon.com/Detector-Wireless-Notification-Securi...

I didn't know there were detectors for these sorts of things.

Landlords can enter a tenant's property for a variety of reasons, including: Making repairs or replacements Responding to a tenant's request Removing unauthorized window coverings Preventing waste of utilities Changing filters, testing, or replacing smoke detector batteries Inspections Helping with an emergency inside the unit Posting a notice of eviction"Research your state laws because some of your comments indicate a lack of understanding of the landlord/tenant laws where you are operating (like threatening the tenants to keep the security deposit if they don't respond to you, I doubt that is actually a valid reason to keep their deposit, or evicting for late payments, or charging the tenants for your warranty repairs because you missed your 11 month inspection window which was your responsibility, and it looks like your lease says you can charge up to 18% interest for unpaid fees, is that actually legal?).

Lightbulbs, batteries in smoke detectors is on them and written in the lease.You can really do whatever you want if it is written in the lease contract but bear in mind they don't own the home and won't care on certain things.

That’s IF the lender decides NOT to pursue a strategy of bankrupting the borrower by filing a ton of paperwork, motions, requests for information, etc.  

Make sure you have smoke and CO detectors in appropriate places, GFCI outlets near water, functioning mechanicals, make sure everything is in good condition and you shouldn't have a problem.

Secured creditors in order to take the property are to put in a motion to lift the stay.