Use the Large Posable Magnetic Flight Stand.
[Buy Product=warhammer-40k-flight-stands/products/large40k,Variant=All]
You can also use the Medium Flat Magnetic Flight stands.
[Buy Product=2x-medium-flat-magnetic-flight-stands,Variant=All]Stand.
For the flat bottomed clear skimmer base that comes with the kit, use the 60mm self-adhesive magnets
[Buy Product=flexible-self-adhesive-magnets,variant=32934330368084]
For a set of replacement bases with preset magnet holes, use these bases with magnets.
[Buy Product=bases-premagnetized-warhammer,variant=30427499626580]