Firemonkey – How to position a new form under a TComponent

  

I am developing an application for Windows/Apple with Delphi 10 and Firemonkey.
My main form has a TButton.
When I press the TButton I would like to create and positioning Form1 exactly under the TButton.
Here there is my code:

//Transposes the coordinates in the context of the form.
myTPointF := TButton.LocalToAbsolute(TButton.Position.Point);

//Transposes the coordinates in the context of the screen.
myTPointF := ClientToScreen(myTPointF);

Form1.Top := FloatToStr(myTPointF.X) + Round(TButton.Height);
Form1.Left := FloatToStr(myTPointF.Y);

And if the TButton is near the Point(0,0) of the form (not the screen) it works, but the more is away from this point the more Form1 is wrong when i open it.

Link for the image:
https://ibb.co/85dfr9R
https://ibb.co/t2stMHv

Thanks in advance for the help.

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