"THC has a quite precise modus operandi that taps into a specific brain function"

In the above example, quite is used before the adjective precise

But this OLD link says,

When quite is used with an adjective before a noun, it comes before a or an. You can say: It’s quite a small house or Their house is quite small but not - It’s a quite small house.

So I'm quite confused here whether to use quite before a or after it. Which one of the following example is correct?

"THC has a quite precise modus operandi that taps into a specific brain function"

Or

"THC has quite a precise modus operandi that taps into a specific brain function"

And also please explain the grammar rule behind it.

Thanks

"THC has a quite precise modus operandi that taps into a specific brain function"

In the above example (link), quite is used before the adjective precise

But this OLD link says,

When quite is used with an adjective before a noun, it comes before a or an. You can say: It’s quite a small house or Their house is quite small but not - It’s a quite small house.

So I'm quite confused here whether to use quite before a or after it. Which one of the following example is correct?

"THC has a quite precise modus operandi that taps into a specific brain function"

Or

"THC has quite a precise modus operandi that taps into a specific brain function"

And also please explain the grammar rule behind it.

Thanks