Multiple Websites bidding for the same Keywords

I remember seeing a help center page from the big G, where they say something in the terms of:
- websites need to be at least 40% different
- pricing needs to be different
- cannot be operated by the same person / entity

Things like that.
I know I know.. if you play by the rules, you cannot. But what if you want to have more than 1 ad showing for different domains for the same KWs, to diminish the chances of your competitor?

We're not talking about BH affiliate sites, but custom ecommerce stores in a niche.

1 account has been running for years, completely WH with good spent.
The plan is to spin up a second account for a different domain:
- use MultiLoginApp with residential IP
- different name and credit card

That should be working right? Or am I VERY likely looking to get the new account, and possibly the old account, banned?

How about footprints like connecting the new AdWords account to Analytics or using GTM? Better not use it at all, or can I use it as long as nothing is connected to each other?

Thanks for your experience + input

Have nothing in connection

Else

It may bring down your ads rank

Or even make you over spend

Google is crazy