There are different ways in which you can connect a monitor to your servers. One option you can look at using is a monitor rack mount when you are tight on space. This type of solution allows you to install a rackmount keyboard complete with LCD display to each of your racks. Whenever you need to access any of your servers in the rack, you just open the display and select the server.
A Monitor Rack Mount Can Be Installed Flat On the Front of the Rack
Another type of configuration you can use with a monitor rack mount is one where the monitor is secured flat against the rack. This option allows you to always see the monitor and the selected server. You can also install a pull out drawer or slide out shelf, and use this space for storing your keyboard and mouse.