Agreed on TSWLM - Yeah, a MI6 and Russian agent killed on his turf (although operating covertly) yet by his invite would have brought Hell down on Atlantis and his operation.
As to MR, the centerfuge bit could have been claimed as a terrible accident and Bond did, largely beacause of Holly's disdain for him, willingly agree to climb in. It still would have brought undue attention to Drax, but he wouldn't have cared as his plan was less than a week from execution and he already had a hidden space station in orbit.
"Bond Logic" - or lack there of, should become a new thread of it's own.
On reflection, it would draw attention to an otherwise secretive billionaire ("I'm somewhat of a recluse") if he had used Bond and Anya as shark food on his own turf. On the other hand, once back in Sardinia, the methods of attempting to dispose of Bond and Anya were not exactly subtle, were they? One can only imagine Bond's report back to HQ - "Major Amasova and I survived a motorcycle missile attack, car chase, machine gun assault from an armed helicopter - pity about the way the machine guns were fixed under the fusalage, the bullets just whistled past either side of the Lotus! - then I activiated the car's submarine function, only to be attacked by a number of mini submarines and armed frogmen. By the way, that Stromberg tanker looks a bit dodgy. Otherwise, nothing much to report!"

I'm amused that we've started something called "Bond logic". In fairness, when you think of the whopping plot holes in some films just for the sake of an action scene, the Bonds don't do that badly. But you can sometimes leave the cinema thinking "hold on a moment?" As Professor Higgins sang, or rather shouted in "My Fair Lady" - "Why is logic hardly ever tried?"