I have a duplex with one meter and I use a Sense (https://sense.com/) device to monitor the total KWH that the upstairs unit is using I then take the electric bill and split the bill up based on the amount of power drawn by the upstairs unit vs the total usage.

But it really gets serious with how you handle showings, your application, how you conduct tenant screening, credit / background checks and your communication style throughout all of this.

Since you're moving in soon, having face-to-face conversations can establish a personal connection and show your commitment to fair and clear communication. 

Hmmm... lets think about this and list just a few things that you are paying them for... tenant communication, owner communication, managing expenses, maintenance concerns, vendor communication, negotiating vendor pricing, rent collections, accounts payable, accounts receivable, tenant procurement, 3-day notices, 7-day notices, 1099s, accounting, and 24/7/365 MANAGEMENT OF YOUR PROPERTY, for pennies of the rent...

I only work with folks if they communicate.

I have also heard concerns about removal and tampering with these devices. - Water: I'm currently including water in rent for both of my buildings, because I've luckily not had to meter my water use.

Next, maintain professional boundaries with clear communication and a strong lease agreement to set expectations upfront.Proactive maintenance is essential.

The biggest thing is communication, keep it touch with your tenant, make sure you emphasize that you want them happy with the property and that you need to know right away of any issues with the property.  

Buyers agent will still be paid, but now you have to communicate your value to your client.Jumping from one thing another isn't going to solve your issues.

Assuming your offer got accepted, the owner would need to get a unit vacated by closing (obviously this will need to be communicated).