We generally recommend using Close To Arrival for Expedia channel. Using CTA can be dangerous if it’s not used correctly.
There can be conditions which can lead to over booking even though you were total closed out. For example , if you decide to do a CTA for August 12th and August 13th as shown in the calendar below.
In this scenario please remember that the guest can make a reservation for any day prior to 12th and do a check out on 13th or later. If this happens then you will have a over booking scenario. To avoid an overbooking, or reduce the chances of overbooking we suggest you to increase rates and to add a restriction for CTA.