Coding of a specific server in links or

We have to measure the speed in several similar devices, connected to several ISPs. It would be fair to test the speed with the same server, but choosing it manually every time before starting the test takes a long time. Is there a way to make a direct link to a specific predefined server? Something like

I know that I can set a predefined server in my account, but there are too many devices to have to log in to each of them.