Properly used leverage, especially when it's invested in something like high quality rental property, is essentially a cash producing machine.

Sounds like this guy is like Noll and his LLC Mastermind Machine. 

OR 1)Buy a Vending Machine Route2)Buy a dealer's license and flip a few cars3)Buy an income producing website4) Become a Silent Business Owner ( Invest in to someone else's business ) 5) If you don't need the money, donate to charity.

Go to Vegas, put your money in the machine and pull the handle. 

The hot water fill on most washing machines are a continuous fill but you would need to make sue the tankless heater can supply the volume needed in the amount of time it takes to fill. 

Podio is a valuable resource and can be manipulated into a lead generating machine if maintained and setup correctly. definitely a learning curve but all database managers have a learning curve.

@Andrew JohnsonHumans are pattern recognition machines.  

I fell lucky mine rent quick I did do have  one with a cosigner the house was never vacant a day, worked out well the pay like a slot machine.

You'll need PRECISE measurements, and will have to give their CAD guy a few bucks for setting up the machine.  

If your only option is to go from above, I think I would drill holes in the subfloor between the joist cavities every 8-12 ft, stick in the hose from the blown in cellulose machine that you get for free from HD after buying 10 bags, and then come back with 1/4 plywood over it.