Foren / Cotonti / Support / IF statement in forum posts.tpl

I added the following IF statement to my forums.post.tpl so it displays an add after the second forum post:

<!-- IF {FORUMS_POSTS_ROW_NUM} == 2 -->
bla bla bla
<!-- ENDIF -->

But, it looks pretty bad cause right now there could be 2 adds and a signature on top of eachoter (I also have an add placed at the bottom of forums.post.tpl).
So, I was hoping its possible to change the IF statement so it adds a block to the second post, but only when the total post count in the page is greater than 2.

I tried many different setups of this but I cant figure out how to do it.
I thought this would work but it doesnt:

<!-- IF {FORUMS_POSTS_ROW_NUM} == 2 AND {FORUMS_POSTS_ROW_POSTCOUNT} > 2  -->
bla bla bla
<!-- ENDIF -->

I searched both the Global Tag List as well as the TPL Tags Repository but have no idea what other statements I should use. The only one which works is the "{FORUMS_POSTS_ROW_NUM} == xx" as I use that multiple times.

Anyone here who can help me with this?