Adding second GPU to my gaming pc.

hi guys! i have a gaming pc which is mining when i'm not playing. know i'm thinking of adding a second gpu at my pc only for mining. i dont want to get the highest hasrate, just want to get some profits as long as its profitable for me. here is my setup:

AMD Ryzen 7 3700X
ASUS PRIME B450-Plus
NVIDIA GeForce RTX 2060, 6GB
2x 16GB DDR4-3000, Corsair Vengeance
1TB Samsung 870 QVO
500GB Samsung 860 EVO
500GB Samsung 970 Evo Plus NVMe
750W be quiet! Straight Power 11
and some additional fans

so i have a second pcie slot where i could add a second gpu. but the distance to the first gpu looks very small. i dont know if its so good when add a second gpu, i'm thinking of the heat and airflow.

maybe some of you got a similiar setup and can tell me if the psu can handle a secong gpu for mining and if its okay to add a second gpu? thank you for help!