For future installs is there anything that can be done to prevent this? 

He has asked;"Provide protection around water heater or furnace to prevent children from making contact with theseappliances."

However, such a provision doesn't actually prevent that additional/junior lien from attaching to the property, leaving the 1st lien lender stuck with the issues @Chris Seveney mentioned. 

What prevents you from doing the same for real estate property taxes?

Yes 2% and most of those are NOT reoffenders it is a simple thing of being a day late to reregister (and yes they will send you back if you are a day late) The whole registration thing has NEVER prevented a sex crime from happening.

Check this out to learn how to intervene before collections become an eviction issue. https://www.padsplit.com/help/article/how-can-i-prevent-a-me...

However, with the frequent incidents and the persistent odor, even after cleaning, I’m beginning to wonder if this has become the norm for STRs in urban areas.Any advice or tips on how to prevent this would be greatly appreciated!

Most lenders will want to see the original operating agreement if it's an older entity to prevent the borrower from adding someone on the operating agreement to qualify for the loan.

The condo board was so upset over this, as it would ruin the market values of its condos, the bylaws was changed to prevent such occurrences.By the way, I attended many on site auctions where no one else came to bid. 

Regardless of the construction quality, that wont prevent double digit annual increases in your HOI.