If price and not aesthetics is the main factor I’d try to find Quirky trippers or PEQ open/close (less than $20 a sensor) and if you can’t find those - go with the new IRIS open/closed. ($23)
The best form factor for doors is the Aeon Recessed since they are recessed ($40)
The aeons and PEQs are giving me very good battery life. The Trippers lose battery quickly for me.
You can do delays if you use Rule Machine or Smart Alarm instead of Smart Home Monitor