I'm setting up my cinema room in my new house and due to having wooden floors I need to route the cable around the room and doors. This is coming in at 20m ish.

I bought D-line cable ducting and a 20m hdmi cable but the cable is too thick and it needs to go back. The cable ducting has all the speaker wire runs in it aswell.

Looking for a thin hdmi cable. I found one here....

Laptone Long 15m / 50 ft HDMI CABLE 24k Gold-Plated 1080p 2160p Hi-Speed PremiumHDMI to HDMI Cable Lead FULL 3D HD, ETHERNET, PS3 XBOX 360, PS4, XBOX ONE, HDTV SkyHD Virgin https://www.amazon.co.uk/dp/B018M57Y..._c-3uAb83KSWPR

Can I get a 15m and a 5m and just join them together with a coupler

VCE HDMI Female to Female Adapter High Speed HDMI Female Coupler 3D&4K Resolution Gold Plated https://www.amazon.co.uk/dp/B06WRNKZ..._6.3uAbTARG88P

The projector is a 1080p optoma

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