Christian, the PRDH website address, if actually wanted, is entered only as
https://www.prdh-igd.com/Membership PRDH (in brackets), not as a template. The FG example you cite has an ID parameter included in it. Don't particularly see the need to enter a template just for the website.
We went through a whole evolution, still ongoing, to get the various older types of links converted to a template format so that if ever the URL changes again, one click by Ales would update all those with templates. So we set up some types of items, as follows: {{PRDH|Individu|xx|lang=fr}} {{PRDH|Acte|xx|lang=fr}} {{PRDH|Famille|xx|lang=fr}} etc. (xx is place for number to be entered). They automatically name the source more fully when saved.
One thing that should be entered on any of these is who they pertain to. Like {{PRDH|Famille|xx|lang=fr}} Pierre Lefebvre - Jeanne Madore; {{PRDH|Acte|xx|lang=fr}} Mariage Lefebvre - Madore .... as a number is not particularly informative, and since the same type of template will be used for successive marriages, for example, generating different families, helps to see at a glance which one is relevant.