I've just installed a brand new built under double oven (Belling BI702FP) in my apartment. The oven works and is sitting on the brackets, however it's not secured to the housing or worktop. My previous oven had a metal plate attached to the top of the oven that screwed into the underside of the worktop, as there was no way to secure it to the cabinets themselves. Any ideas how I can secure the oven so that it doesn't want to slide out every time I open the doors?