I’ve just laid new turf. Are there any products I should be applying to it?

I did a lot of research and did the following to my garden:

Remove old grass including 4cm of soil Installed underground irrigation system with popup sprinkles Level the whole area Add 10cm of new topsoil Tilled the soil Level and compact using a roller Added pre seed fertiliser (only the amount stated on the packaging as opposed to the whole 10kg I bought) Lightly watered the soil the night before laying turf Laid new soil within 7 hours of it arriving (and keeping the rolls in a shared area sprinkling water on it every 30-60min to help them cool and watering it after laying it for a good 30-45min immediately after laying it) Thoroughly water it twice a day approximately 10mm of precipitation each time using my irrigation system (7:15am and 7:15pm) Haven’t stepped a single foot on the lawn, but been using 5ft scaffold boards during the laying process and to measure precipitation

Is there anything else I can do now to help it stay healthy and not cause any problems like gaps appearing, grass dying, etc? Any products to apply at this stage?