Name on the mortgage but deed in LLC

Hi, I'm new to the forum and here's my first question.

I just acquired a rental property and paid cash. I'm looking to refinance it once I deed it in my LLC name. I'm contacting lenders to have a DSCR loan and they see no problem in doing it in the name of an LLC, but they want me to co-sign as a guarantor. The obvious question is, am I still going to be liable (aka piercing the corporate vail) in this case? Is there a difference in being a guarantor or being the borrower?

Thanks!