Since you do only two tests, divide the $\alpha$ level per test in two. That's a Bonferroni correction. You don't need to correct for a third possible test that doesn't interest you. No need to divide by three.

Do two sided tests. One sided tests should only be done if it is logically impossible for the outcome to be on the other side (i.e. you are testing a quantity that can only aver be positive against the null hypothesis hat it is 0).

Don't use your intuitions to justify one sided tests, everybody will think you made the theory up after seeing the direction of the result and you wanted to have more significant results.

Since you do only two tests, divide the $\alpha$ level per test in two. That's a Bonferroni correction. You don't need to correct for a third possible test that doesn't interest you. No need to divide by three.

Do two sided tests. One sided tests should only be done if it is logically impossible for the outcome to be on the other side (i.e. you are testing a quantity that can only ever be positive against the null hypothesis that it is 0).

Don't use your intuitions to justify one sided tests. Everybody will think you made the theory up after seeing the direction of the result and you wanted to have more significant results.