Also, disabling other player names will help.
If you're using a keyboard, you can target then interact with the placard by pressing NUM0 on a standard keyboard while facing it to avoid accidentally clicking on any other player that might show up at the same time. If you're not used to using it, you may want to test practice. If it doesn't work or you're not using a standard keyboard, go to the Keybind menu and check to see what is listed for System - Confirm (will be at the top).