Do schools/universities in EU prefer to appoint PhD graduates as teachers from their own student pools? As far as I understand, EU schools have high regards for PhDs from anglosphere, especially from USA and UK. 

But, what about schools in EU itself?

Suppose,  an International student,

(1) has a bachelor, Masters, and PhD from a same school "X" in an EU country "A".
 (2) has a bachelor, Masters, and PhD from various schools "X", "Y", and "Z" in different EU countries: "A", "B", "C".

Does (2) make any difference if he has an intention of doing job in a school "X" as a teacher?

Do schools/universities in EU prefer to appoint PhD graduates from their own student pools?
Each EU country has quite a different academic culture. Some are perceived as being quite insular, with a lot of hiring from within; some are considered "impenetrable" by outsiders; some are quite the opposite and offer significant perks to try to attract top notch scholars from outside. Each system has its quirks and it is impossible to talk about the differences without knowing which country you are speaking about here I'm afraid.

Speaking personally, I know that the Dutch university that I am about to move to has hired people in the same department as I will be in with degrees and research backgrounds in several other EU countries, but you can't really extrapolate that information out beyond the Netherlands.