I'm in the process of putting my self-built power supply into an enclosure (finally). Since i had them around for years, i didn't use a single transformer, but two weaker ones with the secondary windings working in series. Now, in mounting them into the enclosure, i'd like to know about the optimal positioning of those two regarding their magnetic fields. Is is ok to just stack them and easily fix them with a single screw? Or would it be better to have them mounted side by side? Or is it totally irrelevant how i position them?