This is the correct thread for your post.
Your blocks look great. I collect U.S. singles, but I've resisted the temptation to collect blocks.
The way you have them now, in stock sheets, it perfectly acceptable and will protect them. The key factor, in my opinion, it to make sure the strips/pockets are tall enough that the stamp is completely protected behind the clear film. In other words, the tops of your blocks don't protrude above the clear strip where they might get bent, torn, or damaged.
If you need more stock sheets, this manufacturer is excellent
www.lighthouse.us. Use the Lighthouse site for reference, but you will want to do comparison shopping at other stores. A lot of SCF members use Vario pages to house their collections and can give you input on the best prices.
Of course, there are albums designed for plate blocks. And you would have to consider hinging vs. mounting your blocks. We've had that discussion here several times -- use the Search button at the top of page to find them.
On problem with mounting blocks, a lot of the pre-cut, pre-sized mounts aren't quite the right fit because of selvage.
Hope this info helps. We look forward to seeing and learning more about your collection.
KirkS