So I bought this base. It's convenient, the tablet fits easily with the click position and I therefore much less often manipulates the valve protection.
For cons, I find the outrageous price for a piece of plastic that should cost $ 1 to produce. Do not forget that this base is delivered without transformer or cable. It's just a fact adapter.
Another small problem: it is anyway convenient month to charge the tablet when it is in its protective case.
But I'm happy with my purchase.