I myself am not too sure which metals exactly but any reactive conductor metals can apparently clash with others of the same ability and attract negative energies, try looking up positive charge metals for organite and experiment with some combos, the negative charge ones can be good as the may also shoo away any extra unwanted energies etc.
try it out and see what happens, I’ve heard they are good at the front of your house or garden, even look great under trees and in planters, next to new plants, certain fruits and vegetables, apparently they can have benefits and hinderances for certain plants.
Lots of fun :) trial and error!
Keep up the hard work! Looks so much fun!
I know a lot about them but have never made one myself