"due on sale" and taxes

My seller is making property tax payments as part of loan payment (PITI). If I record a deed and my name is on the property tax bill sent to the lender. That would tip off the sale of the property right? If so are there any suggestions?

Also, My seller wants what is basically a mortgage to secure the property along with an installment note. I don’t see a problem with this, does anyone else?

Any help on this would be apreciated.