Not a silly question.  You have to open the side panel of the case and remove the CPU cooling fan assembly.  The daughterboard sits on a little shelf inside the case and is secured by a tiny phillips screw.  Yes, I believe there is also a DP version of the daughterboard, should sit in the same spot IIRC.  Someone will correct me if I'm wrong... Photos below: [IMAGE]Daughterboard Location   [IMAGE]Closeup  
HI  i have an OptiPlex 7060SFF,Intel core i5, 8500CPU[NAME].ghz It has an INTEL (r) UHD 630 and  a AMD Radeon R5 430  cards I want to attach it to 3 monitors . It is not for gaming . It is to look at patients scans ( CT scans and MRI scans)    I presently have 2 monitors connected by 2 DP ports from the card and it works .   I tried to attach a 3rd monitor ,with a DP cable by daisy chaining but the computer does bot recognise the 3 rd monitor    I want to add another monitor to this setup , preferably by DP or HDMI . Please advice how to do it 
attaching 3 rd monitor to Optiplex 7060SFF