Seeking Advice - Considering Multi-Unit Franchise Acquistion

I’m currently evaluating the potential acquisition of a multi-unit franchise.

I’m relatively new to franchise acquisitions. I have some questions that I'm hoping others who have had success acquiring franchises (franchise resales specifically) might be able to answer.

What are some key factors I should focus on during the due diligence phase for a franchise acquisition?

Are there any common red flags you've encountered when evaluating franchise businesses?

What are the biggest risks you've faced when acquiring a franchise?

Based on my limited research, it appears that seller financing seems to be less desirable in the franchise resale market. Is this common?