I definitely understand your hesitation! My son got tubes around Peter's age, but his hearing loss was profound in both ears, and they had to establish whether tubes would help or not before moving forward with cochlear implants. It was a VERY easy surgery; the hardest part, of course, was fasting beforehand, but they make sure to get the little ones in first thing in the morning to hopefully help with that. I'd barely had time to sit down and find a show on TV to watch after they took him, and they were bringing him back, all done and waking back up. And man, nursing makes recovery easy, LOL.
The fact that he has trouble localizing tells me he's definitely hearing things muffled, which will have an affect on speech later. With Peter being SO young, a part of me says you could wait until a year...but it depends on where you live, too. If you're heading into fall and winter, that's the time of year that is terrible for fluid build up in the ears anyway, you know? You say your audiologist has suggested tubes... it wouldn't hurt, if you haven't already, to at least meet with an ENT and see if they agree and how they can address your concerns about surgery so young.