Configure active and standby mac address in failover

Hi guys, 
I just have a doubt that, if I configure the active and standby mac address in failover, does it will cause any downtime? 
As I planning to configure the active and standby mac addresses in failover during production time and not wish that it will bring any downtime to me. 
Besides that, just need some guideline that do I need to put all the interfaces' mac addresses in failover?
failover mac address GigabitEthernet0/0 0022.90fe.2000 0022.90fe.2001 
failover mac address GigabitEthernet0/1 0022.90fe.3000 0022.90fe.3001
failover mac address GigabitEthernet0/2 0022.90fe.4000 0022.90fe.4001
failover mac address GigabitEthernet0/3 0022.90fe.5000 0022.90fe.5001

Hi Marius, 
Seem like set the failover MAC address was not working for me. 
Last friday I was tested the failover MAC address.
TEST 1
1, Power off primary ASA and secondary ASA work as active.
2, 2821 router able to learn the correct arp entries.
TEST 2
1, Power on primary ASA and failover from secondary to primary. 
2, 2821 router able to learn the correct arp entries from ASA.
3, Set failover MAC address, power off primary ASA and secondary ASA be active.
4, 2821 router unable to learn the correct arp entries.
TEST 3
1, Removed failover MAC address from secondary ASA.
2, 2821 router still unable to learn the correct arp entries from ASA.
3, Power up primary ASA and secondary ASA still in active.
4, 2821 router still unable to learn the correct arp entries from ASA.
5, Reboot 2821 router and it able to learn the arp entries from ASA.
I am not sure this issue from router or from the ASA. But I guess I will try to upgrade the router in term of software and hardware. 

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