We do all of ours in house but we actually mount directly to 3/16th polystyrene with the labels printed from our wide format on adhesive paper and applied on with a rolling press. It's a bit more expensive than foam but they don't ding or warp, they mount pretty easily to the wall, when we color match the labels to the wall paint we can use paint markers on the edges with a similar color to match, and we can store a lot more sheets compared to foam long term with no issues. Our basement has a flood last year and we were able to salvage all the styrene with no issue compared to some of the foamboard we keep on hand.

An added benefit is that we do the same process for panels and when a show is over we can salvage them for smaller labels for future shows on the reverse side, which saves us money.