In the Archdiocese of Detroit, there are two other parishes that offer a Sunday Novus Ordo Latin Mass the same way, at a high altar ad orientem, but without a freestanding altar in front: Holy Family and St. Joseph, both downtown.
In fact, Fr. Perrone assisted at St. Joseph for many years before being appointed to Assumption Grotto. He published a book of sung Latin Preface settings that St. Joseph uses on the altar. Arguably, Fr. Perrone restored ad orientem celebration at Grotto based on his experience at St. Joseph. See the St. Joseph web site for more info:
saint-joseph-detroit.org.
Holy Family has never had a freestanding altar, and to my knowledge, has never (or extremely rarely) celebrated a vernacular Mass. All daily and Sunday Masses are in Latin, and have been since the Council. They have no web site, however.
And we have a versus populum Latin Mass at Old St. Mary’s (where Fr. Perrone was music director in the 70s), plus our Tridentine Mass at St. Josaphat, and weekday Latin Masses at Our Lady of Mt. Carmel and Ss. Cyril and Methodius.
St. Joseph and St. Josaphat also offer weddings in Latin (Novus Ordo) celebrated ad orientem. I was married at St. Joseph in such a Mass, and another couple will be married at St. Josaphat on Sept. 23 in that manner.
Who would have thought that this liberal diocese would have these islands of Holy Tradition…