Here's what's wrong with your example. If there is a demonstrative pronoun (those are words like this, that, these and those) in front of a noun and you want to introduce a new noun in the possessive case (that's that "apostrophe s" thing), the noun in the possessive will knock all those demonstrative pronouns out. Possessives and demonstratives just don't go together at all. So, technically speaking, you can't say "Look at all these Mark's cars". That's grammatically wrong. To make it sound like proper English, you instead would have to reword that sentence and say it like this "Look at all these cars. They're all Mark's." Or phrase your sentence in some other, possibly different, way.
"Look at all those robots of Eggman" would be better, but that sounds a little bit unnatural and, as stangdon pointed out, stilted. Alas, you're going to have to find an alternative way to phrase this sentence out.
There are, however, certain situations where a noun placed in the possessive case can be used alongside demonstratives. But in those situations, it actually acts like an adjective. This often happens with words that are in very common, everyday use such as brand names. For instance:
Look at all those McDonald's burgers. They're all rotten. I'm not gonna eat them!