Modular retaining walls are made to weep and do so much more so than a concrete wall as they are a dry-stack. This means they have no mortar and are engineered to allow the release of water freely through all the joints. It is recommended to have a french dry “daylight” through the face of the bottom of wall every 50 ft but water usually only makes it to this point in flood conditions.
If there is a site water collection system, the french drains in the wall can connect to this and thus not have any weep holes. Again I would not recommend this with anything other than a modular wall system with an all rock (#57 or #67 crushed limestone) backfill.