Thank you
The magnets I have bought at
Supermagnete.nl
Also available in English
It is a German based shop, but does supply throughout whole Europe.
I have used the 2mm diameter 1mm height magnets for the planes. For heavier bombers I use the 3mm diameter 2mm height ones. And the long height markers are 3mm diameter 10mm high.
The bases are sturdy enough, you don't knock the planes of. If you put the bases on a metal plate, you can hold them upside down, without falling. (only when using 5 height markers, then the base will fall off due to the weight)
I haven't had them falling over. Only the plane might turn on its pole. Therefore I am always using the base for orientation.
But there is a risk. If they are close together, and you knock them over, they might attract each other, as the magnets are really strong. So them things might shift out of place.
I still have to play some games, to see if that provides much of a problem.