Is it common saying only υπολογιστής refering to a computer? Or maybe this would mean calculator?
When you're reffering to a calculator in greek, you most commonly say "κομπιουτεράκι" or "υπολογιστής τσέπης" (τσέπη=pocket), because calculators are smaller than a regular computer. So yes, υπολογιστής is fine for a computer (and a laptop too) ^.^
@ Dimitra956826 It is better for "laptop" "φορητός ηλεκτρονικός υπολογιστής" (portable electronic computer) https://el.glosbe.com/el/en/%CF%86%CE%BF%CF%81%CE%B7%CF%84%CF%8C%CF%82
ηλεκτρονικός is the dictionary form -- masculine singular nominative.
But here, there are two computers, so you need plural; and they're the object of the verb "to have", so you need the accusative case.
Hence ηλεκτρονικούς, masculine plural accusative.