This is a great expansion board for the RC2014. It's well thought out and really high quality. Talking of high, yes, it is taller than the standard RC2014 modules, so it will stick up - however the extra room allows for more circuitry than the official RC2014 Prototype Module does. It also allows for a double pin header so you can use the Enhanced RC2014 bus connections. Certainly worth having a couple of these in your tool box!
I'm using the MiniPiio RS232 module in order to use my old RS232 devices to connect to my Raspberry Pi model B (only 2 USB already used). The module perfectly fit into the Raspberry Pi model B GPIO slot and also into the Raspberry Pi 3 I've tested. The support communication is great, professional and deeply technical. I strongly recommand this product for any RS232 needs on Raspberry Pi.