Before the LLC, get an umbrella liability policy that covers rentals in case you get sued.

Is it better to have multiple apartments under one umbrella mortgage or to have separate mortgage contracts for each of them if you want to refinance them in future?

Also referred to as a "portfolio loan" or an "umbrella loan".For the property that you have 30% equity in, you'd need to refinance around 73-75% LTV do cover the existing mortgage and closing costs.

They prefer easy, low hanging fruit), get a good insurance policy, and cap it off with an umbrella policy.  

Meanwhile, since the LLC didn't give the mortgage, its not really under the umbrella of the LLC.  

You may need an umbrella policy in addition depending on your situation.If you want to get into more detail, send me a DM and I will walk you through this. 

Some folks opt for good insurance, such as an umbrella policy that would cover potential issues.

That being said, I like the peace of mind the LLC provides over other insurance options, like an umbrella cover.

Umbrella LLC in WY, then MN LLC for properties. 

Many people end up co-mingling their financing such that if the LLC was ever sued the plaintiff could easily pierce the corporate veil and come after your personal assets which completely negates the reason to ever have an LLC in the first place.99 out of 100 times, a good umbrella policy is a much better and cheaper option to protect your assets.