Installing Netbackup 7.5 VMware agent on an ESXi Host with Linux as the Operating System

I need some assistance with installing the NBU client on an ESXi Server that runs Linux as the OS. There are a mixture of Windows and Linux operating systems both 32 and 64 bit that run within the ESXi Host. Only recently I was aware that NBU does not support the installation of NBU 7.5 on a Linux 32 bit server. My concern here is if it is possible to install the NBU 7.5 VMware agent on only the ESXi host and still be able to back up all the virtual machines without deploying the agent to each one. I would like to be able to select all the virtual machines to backup whether it is Windows/Linux and 32 bit/64bit.