Belling GTG 60 Series User Manual page 17

Do not use a silicon sealant to seal the appliance against the aperture.
This will make it difficult to remove the appliance from the aperture in
future, particularly if it needs to be serviced.
2. Carefully turn the hob back over and then gently lower it into the
aperture hole that you have cut out.
3. On the underneath of the hob, rotate the brackets into a position that
is suitable for your worktop. Then fully tighten the screws (C) to
secure the hob in the worktop. Leave a small gap between the
worktop bracket and the underside of the worktop to allow space for
heat expansion.
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(A) SEALING STRIP
(C) SCREW (B) BRACKET