Advice on updating 3 Dell R720s

Hi all, I have 3 dell R720 looking to update to more recent firmware

Server One R720 3.5" drives

 Power Supply.Slot.1+2 07.2B.7D 
 Integrated Dell Remote Access Controller 1.57.57 
 Broadcom Gigabit Ethernet BCM5720 7.4.8 
 BIOS 2.6.1 
 PERC H710 Mini 21.3.5-0002 
 BP12G+ 0:1 1.00 
 Lifecycle Controller, 1.4.0.128, A00 1.4.0.128 
 Dell 64 Bit uEFI Diagnostics, version 4247, 4247A1, 4247.2 4247A1 
 Dell OS Driver Pack, 15.07.07, A00 15.07.07
 System CPLD 1.0.3

Server Two R720 2.5" drives
 Power Supply.Slot.1 + 2 07.09.50
 Integrated Dell Remote Access Controller 1.56.55 
 Broadcom Gigabit Ethernet BCM5720 - 7.8.16 
 BIOS 2.2.2 
 Lifecycle Controller, 1.4.0.128, A00 1.4.0.128 
 Enterprise UEFI Diagnostics, 4233A0, 4233.1 4233A0 
 OS Drivers Pack, 7.4.1.11, A00 7.4.1.11 
 System CPLD 1.0.3

Server Three R720 2.5" drives

 Power Supply.Slot.1 + 2 07.09.50  
 Integrated Dell Remote Access Controller 1.56.55 
 Broadcom Gigabit Ethernet BCM5720 7.8.16 
 BIOS 2.2.2 
 PERC H710 Mini 21.3.5-0002 
 Physical Disk 0:1:2 DE11 
 BP12G+EXP 0:1 1.03 
 Lifecycle Controller, 1.4.0.128, A00 1.4.0.128 
 Dell 64 Bit uEFI Diagnostics, version 4247, 4247A1, 4247.2 4247A1 
 Dell OS Driver Pack, 15.07.07, A00 15.07.07 
 System CPLD 1.0.3

Questions

What is the safest way to update?  (remote idrac, lifecycle with usb, lifecycle with ftp, other method)

Know I wll need to follow the update path suggsted here https://www.dell.com/community/en/conversations/systems-management-general/idrac7-upgrade-path/647f83d8f4ccf8a8de2ad762?commentId=647f83e4f4ccf8a8de2bb1a1#M28059

With Idrac keen to get to at least 2.30.30.30, as that where HMTL5 interface was brought in.  Should i stop there or update as far as I can?  

I was warned there were some fan issues i drac can cause.

Is it worth updating everthing such as the perc h710 min or the gigabit etherenet?

Many Thanks  Damien