I's say that depends on your financial situation and the amount of time and room that you have where you live.

Can you afford to keep them all healthy and the emergencies that may come up with them?

Do you have time for that many, scooping boxes, feeding, loving ect?

Is there room where you live for that many litter boxes and all the things it takes to spoil them rotten ?

(no need to answer here..... just ask yourself these questions)