Ryan is on to something---there are blanket loans available for the purchase & refinance of 5+ residential properties that would serve the purposes you seek and allow you to consolidate all of your loans under one "umbrella".

I always change to my insurance company due to umbrella  policy. 

Any additional insurance or umbrella policies I should look into in addition to E and O insurance?

Most people get an umbrella policy to cover the property and others you purchase.  

I'm interested in learning how to and if it is wise to try and find an investor or group of investors interested in bundling all my properties (all under 80% LTV)  under their umbrella.  

You might check and see about getting an umbrella policy via your current vehicle / home insurer.

Take title in your own name and get an umbrella policy to cover your personal liability.Then if you decide this is something you want to do on a larger scale you should sit down with an attorney who can help you match your needs and goals with an overall strategy to use.Trusts give absolutely NO asset protection.

If you are worried about liability get an umbrella policy or increase your liability policy.  

What are the options, how much do we need, why do I need an umbrella policy, etc. 

Everything is going under my name on this one and I will be getting a 1M umbrella policy.