Exchange Availability service

I'm looking for clarification about the configuration on cross forest availability services explained in the followin article

Configure the Availability service for cross-forest topologies | Microsoft Learn

We have two forests with an exchange org on each of them.

Forest A 

--- AD     companyA.local

---SMTP  companyA.com

Forest B

--- AD    companyB.local

---SMTP companyB.com

There's a bidirectional trusts between the two forests

they need to be able to share the user's free/busy information between the two forest and the article seems to be what we need.

It mentions to complete two steps 

Get-MailboxServer | Add-ADPermission -Accessrights Extendedright -Extendedrights "ms-Exch-EPI-Token-Serialization" -User "<Remote Forest Domain>\Exchange servers"

Add-AvailabilityAddressSpace -Forestname ContosoForest.com -AccessMethod PerUserFB -UseServiceAccount $true

given our setup am I correct if I do the following  ?

IN FOREST A

Get-MailboxServer | Add-ADPermission -Accessrights Extendedright -Extendedrights "ms-Exch-EPI-Token-Serialization" -User "companyB\Exchange servers"

Add-AvailabilityAddressSpace -Forestname CompanyB.com -AccessMethod PerUserFB -UseServiceAccount $true

IN FOREST B

Get-MailboxServer | Add-ADPermission -Accessrights Extendedright -Extendedrights "ms-Exch-EPI-Token-Serialization" -User "companyA\Exchange servers"

Add-AvailabilityAddressSpace -Forestname CompanyA.com -AccessMethod PerUserFB -UseServiceAccount $true

Thanks