Four widget positions

Position is not decoration. The three bottom placements read as a prompt somebody can ignore, which is what you want when you are asking a favour of a visitor who came to do something else. The centred placement reads as an interruption, because it is one.

That makes centring the right choice rarely and the wrong choice usually. It is defensible on an exit-intent survey where the visit is ending anyway, and hard to defend on a page somebody is trying to use.

The bottom left is worth knowing about for a practical reason: bottom right is where most sites already put a chat launcher, and two things fighting over the same corner is a worse experience than either alone.

Whichever position you pick, the widget renders inside its own shadow root, so your site styles cannot leak into it and its styles cannot leak into your page. Its colours, corner radius and font are set on the survey, and the values are validated before they are used, because anything interpolated into a stylesheet on somebody else’s site has to be.