Have just hired a bookkeeper and at first she questioned having so many accounts but is now finding it a simple way to deal with the complexity of the fact that I have 7 properties and in keeping track of everything.

You WILL be adding $1,000’s if not $10’s of thousands in additional costs (accounting, insurance, banking, and financing will all cost more.)to protect the equity in the properties that a simple umbrella would have protected. 

In the past, I have owned residential real estate in remote locations ( other countries than my own ) and been successful in buy-and-flip, buy-and-hold, and some simple small-townhouse developments.

Look, it's simple, how much does a tenant nightmare cost?

This would not solve the problem for just simple high water users with laundry, showers, water grass, etc. but it is a quick way to find those leaks that are not fixed.

It's really very simple math - buy it low, rehab it appropriately to gain a higher value (ARV). 

This form is 10 pages long and isn't simple to complete.

Model to Image - Some apps such as Veras connect to your Sketchup/Rhino/Revit software and can directly render simple masses into final results.

Our tenants seem to understand the simple fact of no rent, no roof.

Create a simple spreadsheet or written list to compare the features of each and identify the ones that align with your requirements.