surf rack for car?

so my bros getting into surfing also and probably going to buy a longer type board, which means i'll need to get a surfboard rack for my vw golf cause up to now 1 board has been fitting fine into my trunk through my psgr seat. does it matter what kind of rack i get? i was looking at some cheaper ones like this. im a really poor student and cant get anything expensive.
https://surfing-waves.com/shop/itemHC9307.htm
will this be secure enough for two boards around 7'6 ish in size. and i need to get straps for this or can i use some old ropes from the garage? i really dont know anything about racks, never used em. itd be ok to stack the boards on top of each other? do i need to pad them in between when racking, etc. how do i even strap them on? clueless, any info will help. just dont want my boards flying off my car on the freeway. and i dont have any type of case for my board if that makes a difference.
https://surfing-waves.com/shop/itemHC9307.htm
will this be secure enough for two boards around 7'6 ish in size. and i need to get straps for this or can i use some old ropes from the garage? i really dont know anything about racks, never used em. itd be ok to stack the boards on top of each other? do i need to pad them in between when racking, etc. how do i even strap them on? clueless, any info will help. just dont want my boards flying off my car on the freeway. and i dont have any type of case for my board if that makes a difference.