choosing the desktop for an application

I have shell script which starts several xterm windows. I carefully size and place them from the shell script commands. Unfortunately, they are all created in the same desktop, where the script runs. How can I specify in which desktop each xterm should appear?

I played with the -geometry option (of xterm command) a bit by giving them very large x and y coordinates, but it did not work. There must be another way.

Thank you for your help.

PS: I run RHEL 6.10 Workstation and Gnome desktop.