We are working on a Mosque in Qatar. All visitors to the mosque remove their shoes prior to entering the building. We would like to avoid placing mats at the entrance due to aesthetic reasons. Anyone have experience with this?

There is also an adjacent building used as a gathering place (formally when large numbers of attendees are present). This is basically a rectangular building with a courtyard in the middle. There doors everywhere, both entering the courtyard and on the outer walls, to the exterior. There is no "main entry points," they will all be used. Any advice on requirements for mats in this situation?

Thanks,
Sam