This question already has an answer here:
Noether normalization tells us that a finitely generated $k$-algebra is an integral extension of a polynomial algebra over the field $k$.
My question is whether this still holds if we replace the field $k$ by a more general ring.
Question: Let $R$ be a commutative ring, and let $A$ be a finitely generated $R$-algebra which is flat over $R$. Are there $R$-algebraically independent elements $x_1,\dots, x_m\in A$ such that $A$ is integral over $R[x_1,\dots, x_m]$?
EDIT: Seeing that the general question above was already asked, I should change it to the case I am really interested in:
What is the answer in the case that $R$ is a local $k$-algebra of dimension zero over some field $k$? (So $R$ is nearly a field, but not reduced.)