How many sunnah prayer rakat are there related to dhuhr prayer?

Sunnah fajr= 4 rakat. 2 rakat fard+ 2 rakat sunnah. Sunnah Zuhr= 10 rakat. 4 rakat sunnah and fard+ 2 final sunnah. Sunnah Asr= 8 rakat. 4 rakat sunnah and fard. Sunnah Maghirb= 5 rakat. 3 rakat fard+ 2 rakat sunnah. Sunnah Isha= 10 rakat. 4 rakat sunnah and fard+ 2 final sunnah. This is what I have done. But when I go on deeper research this is the correct sunnah. >Narrated Umm Habibah: The Prophet (ﷺ) said: If anyone keeps on praying regularly four rak'ahs before and four after the noon prayer, he will not enter the Hell-fire. > >Abu Dawud said: Al-'Ala' bin Al-Harith and Sulaiman bin Musa reported it from Makhul with his chain, similarly. (Sunan abi Dawud ) So does it mean I need to do... 4 rakat sunnah, 4 rakat fard and 4 rakat sunnah 3 times 4 rakat Altogether is 12 rakat zuhr, but 8 rakat sunnah rakat. Moreover I have heard when someone pray 12 rakat Allah will give house in Jannah, so does it mean I need to pray exactly 12 rakat sunnah or it can be more 12 rakat. So my point on zuhr should i do 4 rakat sunnah+ 4 rakat fard+ 4 rakat sunnah or 2 rakat. I want to clear the misconception about sunnah rakat.