I'd manually set it on a platter drive rather than an SSD and considering the amount of RAM you have I'd set it at no more than a couple of gig.
You don't have to have it the same size as your RAM, and there are some tricks you can use to manage it a bit better.
If you have plenty of RAM you don't really need a page file at all, except that some applications, especially older ones like to see it.
In that case you can trick them by setting up a RAM drive, and setting aside a couple of gig as a drive and use that entirely, the advantage is it's as fast as RAM, because it IS RAM, and that your system still has a page file, so applications are happy.