The missile launcher must at least match missile size, so you need at least a size one launcher for AMM, if you had a size 4 ASM you would need a size 4 launcher.
That said, you want to build the smallest launcher that fits your missiles as possible because the smaller the launcher, the faster the reload speed, you don't want to be firing AMM at a rate of once a minute, so don't put them in big launchers.