Unfortunately, this is true...attys leak sometimes. But I must say that I drip in my 510 attys all the time, and I rarely have leaks. I did get leaks often when using carts...so I don't use carts anymore. The attys are almost all Joye 510 attys, pretty much the only ones I buy. I use 4 drops, directly on to the bridge. More than that might leak.
Although you want to drip, I also recommend using cartomizers. I use Boge soft-tips, either 3.0 ohms or 2.4 ohms. To me the Boge 3.0 ohm on a 5V PV is about as good as it gets.
Another option that is really similar to the drip experience is the E2 cartomizer, which uses a ceramic
juice tank, essentially. Remarkably good
vaping, even at 3.1 V (regular 510 batt). VERY similar to the drip-vape experience.