Is this something that could bring value even if one of us is not seeing the physical property before an offer?

PM sounds like a jerk.. and your stuck defending someone you hired to do the best job possible for you.. they dropped the ball and you need to further monitor what they are up do and doing by physically taking action and checking what's up.  

When I am asked to stage 3 or more property's at a time, is it physically possible to do it. 

One major appeal is that real estate is a tangible asset that you can physically control as opposed to the the stock market where we have 0% influence on our investments.

This is not something you will understand without physically being in the neighborhood.

The second problem is that rental houses quickly physically depreciate with renters and have more maintenance issues than an average apartment.  

We are both physical therapists and we do not find it wise to have 100% of our income be reliant on being physically able to work (disability insurance can only provide so much comfort).

We could use a little physical help (not financial) finishing this home and are happy to return the favor with a lot of help on your current or next project in the area. 

You will manage your physical plant (the property itself) and also the Human Resources (the tenants).

This will likely involve a regimented program of sending letters, physically getting out and spending time in the neighborhoods you want to buy, and networking.