You can still make ADRs, you just can't use the 90+10 rule that onsite guests can. You will have to call everyday at 90 days out for whatever ADR you want for that day. Either that or you can wait until like 80 days out and then book all your ADRs at one time. I'd call every day though. Onsite guests are going to have an advantage on you though, because they can call at 90 days out and book all their ADRs for the full week, whereas you are going to have to call at each day's 90 day mark.