its looks ok. you should check your stats for few days and when you're not happy then change it. best CTR will come using the 336x280, 600x160 ad formats and i think you're using 336x280, better move on top below the title, that could help more CTR rather than 468x60...
You asked for ad placement suggestion and where it comes spamming ?? even i think every real earners hate spam and this not a spam suggestion forum...
you are asking for placement suggestions that means you want greater CTR. and if you want greater CTR then change the ad link colors to more prominent, i will go for blue and placement is good Use 336x280 block.
yeah me2, i found that using blue in the title increased my earning a lot, maybe becuase the majority of surfers know that blue means link