Q: Do we need to use separate VPN services in 1 household?
A: This depends on your preferences, and on the end user license agreement with the VPN services.
If everyone in the household that wants to use the vpn agree on the same service, and that vpn host allows X number of devices to be used, All is good.
But if one person prefers one provider, and another prefers a different provider, or if you have 5 people in the household, but the provider only allows 3 devices, you may need multiple providers.
A possible solution is to choose a provider that is compatible with using their vpn on a router. Once you’ve configured the router for their vpn service, every device in the household gets vpn coverage, and it counts as only one device.