If you want to put the deposit in a out of state/online bank, then you will have to furnish a bond.  

You can also check their reviews online at Google, Facebook, or Yelp.

Also there is no restriction on acquiring conventional loan on primary residence even if you have maxed out on conventional loan for rentals.

Realtors often claim they're restricted to Realtor use, but that is incorrect. 

And there're restrictions on how you can use these accounts.

To managed it a bit easier (when you grow to more than a dozen), it'll be better to have one online login and manage all 'child' accounts.

In Land Investing Online there is a free support group as well as an affordable monthly subscription (I think $100) where you can share your deals for input from the other members. 

These relationships became the foundation of my journey, providing me with insights that couldn’t be found in books or online courses.Building Relationships with Intentionality: Beyond TransactionsOne of the biggest lessons I learned early on is that relationships in real estate are about more than just business transactions.

Yes you can but it depends on the lender some lenders do not allow due to overlays and in house restrictions. 

The lending options will differ based on this: For 2nd home, 10% down is available, but there are restrictions regarding how much/long you can occupy the property.