Not sure what your teams develop, but it's very rare that I see a developer genuinely needing more than a total of two screens. I will even go as far as saying that more than two screens is environmentally irresponsible. Maybe have a chat with them, as we all know software engineers like to do things just because "they can". Some of them are also very spoiled. I used to work on three monitors because I could, then moved to just two and my productivity has not suffered at all. Heck, give me a 32" iMac and I'll be happy with just one!