Magnetic attaching onto suspended ceilings. It couldn't be simpler; you only need are stairs.
Carrying capacity a piece
size 16 x 27mm
size 42 x 14 x 37mm
size 57 x 15 x 39mm
has a cross-section of 20mm; the thread is MX6x1
size 16x30mm with a weight carrying capacity of 2kg