Ooma office specialist days no multiline desk phones

I have read a previous post about 4 line office phones but couldn’t quite figure it out. I chatted with ooma and was finally referred to ooma office specialist. I was informed I couldn’t use multiline phones. I need 3 regular desk phones with up to 3 “lines”. When someone is on one line, the next line rings. When no one is on the phone, all 3 phones ring at the same time.
If I answer the phone, and it is for an associate in the desk in front of me, I can say Bill, pick up line 3. Very basic stuff. Cn someone A) confirm this scenario is possible with a multi line phone and how to do it; B) give suggestions on what type of phone to use if not a multiline. Thank you.