Can craft multiple mods recipe?

Therefore, you can only add two extra crafted mods. This strategy is used to create high-quality items with up to 5 desirable mods. This crafted modifier is itself counted as a modifier, meaning this craft essentially allows you to add two other crafted modifiers through the crafting bench, instead of the normal one.

Does MultiMod take up a suffix?

Multimodding takes up a slot, and you can only have 6 slots total. You would never multimod something that has 4 slots already taken (unless one of those slots is from a crafting bench).