Modal on the mobile: is bottom the best place for the close button?

I have a modal/lightbox with the gallery on the mobile (it doesn’t have action buttons, so no chance for cancel button).

Considering latest research on thumb zones, does it make sense to move “close“ and/or other actions to the bottom center?

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Apple seems to do it on the iPhone X landing:

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Or does familiarity (top right corner) outweighs difficulty of reach?

(Personally I have troubles reaching top right corner with one hand on iPhone 7 Plus)

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