Yes this is possible. Pretty sure you can just use google manager and have multiple accounts. At least you used to be able to. I have around 20 YouTube’s on one email. But yeah you can use a different email and same ip.
Yes, this is good limit. If someone spams with more than this, Google may detect this as spam.
Depends on how many account you are making. If you making more than 20 accounts, they will consider it as spam and shadowban you.
You can do this. Suppose there are multiple creators in same family, it is obvious they all have same IP.
