Fortunately our remedy was fairly simple, large floor fans and new ceiling tiles but it was a massive inconvenience and the damage would likely be much worse if it repeated in units in other places.

I would spend some time working on the formatting to make it as simple as possible to understand for a banker or buyer.

We use Avail.co to manage our leases, and it's a simple box to check to require tenants to get a policy.

(in which they did)  then pay the price, or another tennant will simple as that🤷  

A simple example I have used before illustrates this point.  

@Grace Norton adding to what's been written already, you'll want to get a 2-year work history for both.To consistently pay rent, requires consistent income, which requires consistent employment.Pretty simple concept!

But owning 29 houses seems to be an easy number to self manage so I think I’ll hold off on buying anymore and keep it simple with what I have.

In a perfect situation, the payment will still be delayed (even if by hours) using this additional system.And secondly, many of these vendors have "clawback" provisions where, in their terms of service, you give them permission to go back into your account - even weeks after the fact - and reverse a deposit that was made by your tenant.My system is simple, allows for tenants to pay through multiple means, and does not cost me anything extra.

Which I have heard a guru say he uses as a technique, no escrow, simple paperwork between buyer and seller.  

The quicker you can take action on the high dollar value decsions the quicker you will be able to grow.For sure take the time to setup the right foundation, but keeping it simple and easy when you are getting going is a safe bet!