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2 x WS-C3750X-12S-E
1 x WS-C3750X-48T-S
Is this possible or do need al switches to be IP Services (-E) ?
Yes it's possible and no you don't need. IP Services and IP Base can work in the same stack.
Generally if using IP Services, you'll want at least two switches with that feature set license so if the master fails, the other IP Services licensed switch will keep the stack running IP Services (otherwise the stack would drop down to IP Base feature set).
(Remember on a 3750X stack, you'll have the same binary [universal] image installed on all your stack members, but each will have its own device specific feature license.)
As it appears you have dual 12S with IP Services, you're covered for IP Services redundancy.
